Hello,
We apologize for the issue you are facing with the SEO Analyzer in Rank Math. The API Error: HTTP 400 typically indicates that the server is unable to process your API request due to various reasons. Here are some common causes and solutions:
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Website Under Maintenance: Ensure that your website is not in maintenance mode. If it is, switch it back to normal mode.

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Check Website Status: Make sure your website is returning a 200 status code. You can check this by using the HTTP Status Checker. Enter your website URL and click Check Status.

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API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout error.
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API Requests Blocked by Firewall: Your server’s firewall might be blocking our API requests. You may need to whitelist the IP 46.30.211.100 and the user-agent RankMathApi/2.0.2; https://rankmath.com. You can do this in your firewall settings or ask your web hosting provider for assistance.
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Locally Hosted Website: The SEO Analyzer only works on live sites that return a 200 OK status when crawled from an external site. If your site is hosted locally, the SEO Analyzer will not function properly.

If you have tried these methods and are still experiencing issues, please reply to this ticket with your website URL so we can assist you further. Thank you for raising this concern, and we look forward to helping you resolve it!
Sources:
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
I tried all, but it didn’t work.
Hello,
Please get in touch with your host and whitelist the below IP addresses and the user-agent RankMathApi/2.0.7; https://rankmath.com.
46.30.212.200
46.30.212.201
46.30.212.202
46.30.212.203
Once done, please head over to your WordPress Dashboard > Rank Math > Status & Tools > Database Tools and click the Clear SEO Analysis and Remove Transients buttons to flush the SEO Analysis cache.

Please clear your website and any server-level caching on your site before doing the SEO analysis again.
Let us know how it goes. Looking forward to helping you.
Thank you.
Thanks for your reply. I tried as per your instructions but it didn’t work. I don’t know what’s really going on?
Hello,
Could you please share your website URL and the server IP address so that we can check the issue from our end?
If you’re not sure about the IP address, you can get in touch with your hosting provider to get this.
Looking forward to helping you.
Thank you.
HI,
Thanks for your reply.
Here is the IP- 116.202.88.6 and the URL- https://vapershopbd.com/
Looking forward to hearing from you.
It’s now solved. Thanks for the support.
Hello,
Glad that everything has been sorted out.
Please feel free to reach out to us again in case you need any other assistance.
We are here to help.
Thank you.